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Technical Data
| 1.56 Semi Finished Photochromic Round Top Lens(Brown/Gray) | ||
Material: 1.56 Index Resin(Ne=1.56, Abbe=42, Specific Gravity=1.15) Segment Placement=5mm down~5mm Add Power: +1.00 to +3.50 in 0.25D steps Segment Size=28mm |  | |
| CONVEX SURFACE | CONCAVE SURFACE | |||||||
| Mominal Curve | True Curve | Sag (sagitta: 40mm) | Radius | Radius | CT(mm) | ET(mm) | Dia(mm) | |
| 1.549 | ||||||||
| 2.00 | 70 | |||||||
| 4.00 | 4.17 | 1.50 | 131.74 | 132.50 | 8.0 | 8.0 | ||
| 6.00 | 6.35 | 2.30 | 86.45 | 88.80 | 8.0 | 7.0 | ||
| 8.00 | ||||||||
Product Features
RT-28 Photochromic lenses are clear indoors and transition to dark reading sunglasses within 28 seconds outdoors. Designed for multi-purpose, they allow you to see as you would normally in the distance and yet you simply lower your eyes to read. Indoors you can read a book and won’t have to take them off to see your friend across the room. Outdoors they protect your eyes from U.V. and bright light while allowing you to read and enjoy the view simultaneously. One pair to wear for everywhere and for every activity: at work or home, inside or outside, see far and see up close.
----Why Go For Photochromic RT-28 Bifocal Lenses?
If you choose photochromic bifocal lenses -
You do not have to carry along with you, a separate pair of eyeglasses with bifocal lenses
You can easily read a book when indoors and do not need to take them off when stepping out
When you are under the sun, they protect your eyes from bright light and UV rays, allowing you to read and view clearly at the same time
Generally speaking, if you wear prescription eyeglasses, it is a good idea to opt for photochromic bifocal or photochromic progressive lenses. Because they not only shield your eyes from the harmful rays of the sun but also provide you with a seamless and comfortable vision for different areas.
Coating Choice
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